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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4e02bd28f29fb2d51b908849e38fbe3ec38f4bdfc14664a9e241bf03a67114' 
  AND token = 'tHF3tRGU1tCV837oNDcJPABbsPxDTWv5aISFxghKWQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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