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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891cd61cef96616a9715a0cecb970a08531e38e93a2dda29a103e79d0f935d95' 
  AND token = 'hq1/z3l2V3isX2V03wY7sMHaYVL7edry8rfhvy6s+E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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