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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b8db9ced29080140723da9d79b8ce4092ca41d6fc5349e129421f86771847d' 
  AND token = 'OJKN3TWZMp80zBn/0ImWSTP4dgesLeDvlDjce4oRnNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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