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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89cdc4710e8b53a0d9f5e5543d62e93d88e89cb2a0b7c55df83cf1ca860cf20' 
  AND token = 'V2c/Ulw43VJEduivGva9JVipDeCHoUAX7kLdGEvVK2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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