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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a31a0c8abd07d4297901b789ca7bf96cce1be7c3d40e5f021862efd05d6e427' 
  AND token = '5eQzrcHv2fdh+UrtFuAGN7FHiP3aRxaArSH9MFm2KJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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