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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce79b6d659b83c85bc868553c9df3de29fb428fa6c013a92cdb75be27b9f61b5' 
  AND token = 'xhKuA3XTA/SIyLx8+6TG/nbTnYP66gxw8aHOfsaIyMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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