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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93071fb4a891b941746b1f902a55b1977815173c3e322ef59c4202853071c9ca' 
  AND token = 'yoFL8DOhgLqr8adACeiVE9/ZgOwenrP1sqVnnPZVdLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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