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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9628b64a762b24c62ac627fb21ef2f2d26d892a0bf0dd70f43d300e886ee51b' 
  AND token = 'nqMZKp2t412zih2jHMLv/T43wDIMc7GDM9vtBGUmxho=' 
  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"
    }
  }
}