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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e90eda0ceac15bfee0f9f5eba34f4490fac3239e4bb3367c7816b2471e7a44a' 
  AND token = 'TbankCDo6aIbx1ANZi4kXBoFcOOL0Hs7Ynq7zKOzPU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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