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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc7663374c58fa6a99cbe81222ccee3ab4dd2c800a350b8ebedb2ff3d5910c0' 
  AND token = 'NKUWJnoUKQlM/S20vX7bpGA2e16lKbp6zPbiB23iYDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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