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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66298658fc70c1dc6e811a970a7c8c1f9629de56c069660e2a0127f6b178f767' 
  AND token = '/uphOFVR0EGdDARdu4NYFw8Vm9i/gneEeik6BkT5wSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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