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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ddc4e9018f9bce898a4931f3600e5be1e24bc983ab5b7a395cc532601fc040' 
  AND token = 'c5DWdAbuH4ensh79zv7jNtsvLIsFx5oBh9ro9CyCxGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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