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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a209b79f2da422a875a58acc0c2f499c7ed116c53f5827f7f604b4b59f376e8c' 
  AND token = '90HI4kiWQt1jVrrNjAdQoNL3vvVnkWzxggfK09JHFt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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