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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89d0f98169b21ecc945a93b4d0602748c12d8ae3bc2be0b0555610cf2f2f38b' 
  AND token = '8AtIXnb2av8h+JAZplT547pvC59fbXVXm8+vkwr8p60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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