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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9dbe4b896d194d4e30db6dd32c1163c86335222d6e98c41468593882a3d6c0' 
  AND token = 'ld+wjyzQbZw/XRM+DYlw2JejMOLV3z58qkyKqaAP/10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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