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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a062bf096b7dace9ad9a1964d2bc9a02703dcb7a1c2828b0e45cfadb79e86672' 
  AND token = 'NCstgjh3YSxbyg0feHoJJjWXFRuQid30wtX6c8bNArg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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