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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c469345f4ce6addaaa5adcf0f941cffde159f2bc2ec134fd44973d0d7250834' 
  AND token = 'sE0l4t9IvVWRmRGqx4mj89TQ8sTuC2/Iwbsdc8wlJPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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