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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd0de6c0f9a987bad07970d1a9b70ab9a6f6881219c1e1ef664d62642039af8' 
  AND token = '2veGBirP1JxusyOxsTWs1JHCUoBaVYkCqW1TmPFvA7Y=' 
  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"
    }
  }
}