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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e077b9169288d698a3871bb9896c4456f7e67ea3a0878c3f0b05a05e4421174e' 
  AND token = 'Lx+WYBV45uW4QA8yT6vK34NSZUt69HmmxL+WQlkLQE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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