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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd757fb70a8fa49494162494890b57e090f0eb900b2b02bbb9fb2a15024f4d08b' 
  AND token = 'wavidGM4TZ30PIZ1qD3NlqYXGyvfIa6MvimiS7HLF5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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