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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857b680ab9ac825c7351676efc4c2f88a40535d5b786344485603f0e3731eec8' 
  AND token = '7SkJgxmliWpbXQDJaMCF3oEE5F3PvZowsHqowFH5A5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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