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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa23b4add6d42cf1e4a3065240347ec61e4bead39111da540c9e6bf680e92a7' 
  AND token = 'zfwGr1piJoltPL62NGTb3pRDz6p/WkomvtwXnlr9ca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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