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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d242cb24bc5e88fe508fc2951ed0a0488948525b6cce547cb47353c972cfb10' 
  AND token = '7jkCecECiNaTeQv1farMnWKeuZYy0wZodK4flFFmrcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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