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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27780c5dfc053f452047924dc1fc06ae1f627bd343cb7800b78b0ef62d716ce' 
  AND token = 'TR3IrBEZSlT9sQs1+1k7fCD5+A4V8/WMHnrmaWLIiB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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