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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96864ce05f317e56eb2b214f5bfd95d3bd14c51f80c5dd370d0f6cc5136e93cb' 
  AND token = 'MeNiHeog867fSEduO0WvTcq8sk7sjfsL6dXDPhdOpjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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