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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca679ace04b1f59501965f915f6e2c6bf528fbb3cdf5d727f8b3a6fbddff44e' 
  AND token = 'wNMG9MdLmsLk1p09dkLz7KBu9FaIH+ky4l05lsMp45c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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