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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52120287c282bf52107aec9994106bd1ac60f3b4ec4fc6873ab64bd7c42a489b' 
  AND token = '8QnCwLaBSA0DdVt/cEO/5dS4Dia5jiEbmxYmBvqHfN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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