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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483f972f9dd2df8578af67c17ed1f98fd9d2d7502ffc80078c9c3eb4d0118647' 
  AND token = 'IZjZjRGd67O0s37d5DcwpW41APc0QKapB78snsBCuJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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