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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a686130061e141619c0feda74174cf33f65767be68bc25966bb97d46c9e93bea' 
  AND token = '5JcbYZkhMoXqZIFbkBpz3UoNvvyQz781ULXrJ+0q5So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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