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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e3858a9c1476031d1fc9ba61daaa36c26fd39bce715eb0313d94bd42c46dff' 
  AND token = 'i7A7uoMqksMwA8kbe4TIUr9FOstXfpG8ag1Biz4jdtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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