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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d91c535b0d0b4dc52481bebc9874f4ab67b6907b06e4ea0875703593a21081' 
  AND token = 'BfVXo2DuLAntoomM6Vzc+UQWqRD2U9FC7T5mz6JG3sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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