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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070e02d2b5e4979f1e24c72d52b076a294a39417fea917910e393f54867ff914' 
  AND token = 'nzv5OYkTRfETSj+GreJKGVt02eG6/kE0ljGm2L3WHFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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