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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee9be853de4b01ca8fce2095719c29538a19c3b9657d2cb7e5a771393058b2a' 
  AND token = 'iJ4c1I/IrTXhVfWS8hRYvR9842OWY0kmelsoJ4NgEK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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