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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4470272454db661bf1e0cb4d19736bf4a6c26114a8ea7638d0713985509f411' 
  AND token = 'FPmo89d7g/GkLeiwZx+WjUu8C9UmeMwi1f3DV89NmBo=' 
  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"
    }
  }
}