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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6d20e4e517bb6da288c34c504504afa918aeb58e19f131acf6d2055595b685' 
  AND token = 'AWS2Xg5kX4vnhRjbM9JXI2Zs+2IpdwQuJGkk+g6Uk/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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