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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26084790b19c83b1db03b93dfe022f4be5d7450c77187f70ee18dd55be4d9097' 
  AND token = '3sl5H+wuZTFXFJECWLkmKh9I3W6H6xfSuTHNq8j7aH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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