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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9303c79f35e22f3383d5565d01371f5599a5be6e551e6831d6f161665b8dc539' 
  AND token = 'zOTAOyb3Ry3eNz2wtnZeQO5z3wAojEIodkMZJbnBo40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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