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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660324f49085e25949e2bc903686c76044ac7593e0d15fa3ef5ad40001031b5e' 
  AND token = 'nu+IktkSAIdk1LRJZfkrKOBWOIT3TIZ2p6RsQjA0e6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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