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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fefb40ef4fea365f1b1be1c810fc58bb2b776f36a6d0b1550a4f0adc248089' 
  AND token = 'Kwslcig15qRbevbzFPBB49HtFrlz/i1efhDYRokmtCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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