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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65de10e418963e3572d0b8c30492e867a0ee258437c55d4d3b2384b0aae0b8e7' 
  AND token = 'Zm/Ln5DtQcb1Ur7kNm4wciau3qAxBauSqk3il0mwXh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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