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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923465cc3761cecda7ba74bcf10302ee7d5b4f7ef4b0c266cd45390a93656fa1' 
  AND token = 'sm1EEceFha/MTgsU0Ccznv/X+pSfu0fjJk0LCIRxrrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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