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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0424b1f7c49e0411cd81d65ac63e109a1bfa6f204909543fa8198de3b40c4edf' 
  AND token = 'p+3I3AkH0GOK226CrA8ikE0R+j/MBDdDqAsBPMEUy5Q=' 
  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"
    }
  }
}