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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a4e59d215b2ca9bd5c15111d9028c4a9d1be11434b5e6edf243fa308a18106' 
  AND token = 'bM+4rcyvlG72TPMVVikSfI0wPeFqeT/zefs525Ffyic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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