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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82db3b268ba2a58b4a6e3a374c55901b818273718859e675ae3c8fd0b5b7659' 
  AND token = 'icn3L1q1HJRPqAjXLZzxv8F202kD1Heyn4aPg7c/TZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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