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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e35b0a0110f60ad1c8053f8fa3eb82a98b001e3883d5277d2fbb37e3666c1b9' 
  AND token = 'xiIo3W6MJL2QrazKx1N2C3APR7ESB3FZzEiP3NO53Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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