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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b567e261f7e354a08a3829674b5bf225af23cbf051357aa817d3fe8e5d0f00' 
  AND token = 'h4AM5pCW3XX8YvFA2UNjPlqHvqkRrUpEL4BYHP8f9a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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