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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6de6a43edb7b34ffc5af642abefdea2ae8f4cf036b9e524009676e1a5228c6b' 
  AND token = '4gTCwfnqn2J6c4v1y8yLO6gme7wyi0SbzBqSMvdPxNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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