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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fff8d920952604e09f9c8a4b97c90e23c72bd60ca560fb724b42e500c3a1cbd' 
  AND token = 'i5rJRFB/M59WkBgOkyZ6ZJB5rU2IbJg0lGBF+JRKu+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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