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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a08563e453bfa7af56788c980eca08f5b0bdfbc0ff18b816283d3af1f75c89' 
  AND token = 'htGgT0o4olQwXB6FUQJaPGy+QWtKSz23gBZcl7W8hZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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