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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e59fba6531007f908cdec38158d33e6989b2095680fce052c65aa22c23aa60' 
  AND token = 'qTc6OnO1IPcu1Upul1j2EP66vknRIuokLqbK1n1yphQ=' 
  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"
    }
  }
}