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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edc6a238c42300bcfdffc29a6955e019868ed3b07ff75b6bc73d0140bc3d3f6' 
  AND token = '8s6p9tHjsmpUGuEq5/RpbkAghF39lTxMmQN/OnDpLXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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