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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7172b89bf3193244ac1f780a513716ef5e344772a1ce9be5fa99fef2929d77' 
  AND token = '9A694nxowcAzOXVn8bBE1DnTWlp7YlRkcVjyY3MndNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}