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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb7222a6f5b3d7d8a3b6ab7de2cd29be4c85f06e3433a3763ef6a51fe49ebac' 
  AND token = 'jbeHDCXd0Ycot7ObGb9LVDxOaCzLVOYc+6Y5krZqDQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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