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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de2a3d89e2df9caf35a01abbec13bfbe2ce4c5b7288fb4e98d81dc0989eb7d2' 
  AND token = 'yTVl+iRaJgya+AcRJggFT1QqoNcbVe0yPGu/P833CEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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