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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18912c4cf25936ff4f3b6f57f199293172c3fa58e573de4ffb8dde45880f224c' 
  AND token = 'ZGA7faP8zFtE9951XSB2PSRiNMD2ppvYC8lj2zlicvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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