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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff218350c869627c9da53bd4890c48c5ad81511f00e8bd4d5037862d0f202b5' 
  AND token = 'NymLnr8rV2x0cZfWawu8Hva13z9kp2Nspq0zOhlDxrA=' 
  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"
    }
  }
}