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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f29f71b07555e6e6cbf32e04e2a56c7e83140a6c066f18996546c38bd52e7f0' 
  AND token = 'CwpCK4k4tpo30AfQRAC2rVPahz1J4EgObcNBRT5/IzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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