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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71518db196dbf318444ee2e47bc04a695e3653709ae5c498b09a6ca66f2f1dec' 
  AND token = 'm12bVPULAh7hKpyGrX33hcOka2iKSnn8tWt7oq7wIRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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