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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178f1382fc8887353d0a298215c52205896f0489f1f74abc67db26788ea6dd6b' 
  AND token = 'cW9/5e1YQGepY3S8/LSMMDOPt0jqQMvXyBDjQtKotqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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